Azo dyestuffs insoluble in water and fiber dyed therewith



Patented July 14, 1936 UNITED STATES AZO DYESTUFFS INSOLUBLE IN WATER AND FIBER DYED THEREWITH Leopold Lash and Arthur Zitscher, Oil'enbachon-the-Main, Germany, assignors to General Aniline Works, Inc., New York, N. Y., a corporation of Delaware No Drawing. Application August 7, 1931, Serial No. 555,86 In Germany August 15, 1930 13 Claims.

Our present invention relates to new azo dyestufl's insoluble in wate and fiber dyed therewith. I

These dyestuffs contain as typical component once or twice an arylamide of the following formula:

radical R by means of CONHgroups (which groups are named throughout this specification "carbonyl-amino) and that it may be once or twice attached by means of azo groups to the aforesaid radicals of the benzene, napthalene or anthraquino'ne series, a general formula covering all the dyestuffs forming the subject of our present invention cannot be given.

The dyestuffs are prepared by combining diazo, tetrazo or diazo azo compounds of the benzene, napthalene or anthraquinone series which may contain alkyl, alkoxy, aryloxy, halogen or nitrogroups as substituents, with arylamides of the above formula.

The dyestuffs may be produced in substance and used for making color lakes or they may be prepared on fibers. As fibers suitable for the production of these dyestuffs thereon may be named: cotton, wool, native and regenerated cellulose (viscose), ethers and esters of cellulose (acetate silk).

when these dyestuffs are prepared on the fiber according to the ice-color method an intermediate drying operation may be dispensed with on account of the afllnity of the arylamides to the fibers. Thereby mainly brown dyeings are produced, ranging to brownish black and black according to the diazo compound used, especially suitable for the batlc style of dyeing.

formula may be once or twice attached to the The 1,2-substituted-4-hydroxy-benezene-5-carbonyl-amino-aryls used as combining components in the production of our new dyestuffs may be prepared by condensing the 1,2-substituted 4- hydroxy-benzene-5-carboxylic acids (see Ber. d. deutschen chem. Ges., vol. 26, page 1851; vol. 11, page 30; vol. 12, page 435; U. 8. Patent No. 1,846,- 127) with a monoor diamine of benzene, naphthalene or carbazole series the nuclei of which may be substituted by alkyl, alkoxy, halogen or nitro-groups.

In order to further illustrate our invention, the following examples are given. We wish it, however, to be understood that we are not limited to the particular products or reaction conditions mentioned therein.

Example 1 Well boiled and dried cotton yarn is impregnated with a solution containing per liter 20 grs. 20 of 2 (4-hydroxy-1,2-dimethyl-benzene 5 carbonyl) amino-napthalene, 30 cc. oi. caustic soda lye of 34 B., 30 cc. of Turkey red oil and 20 grs. of common salt. The goods are well wrung out and developed with a solution containing per 25 liter the diazo compound of 1.62 grs. of 2,5-dichloro-l-amino-benzene and being neutralized with sodium bicarbonate. Then they are rinsed and soaped at the boil.

In this manner a brown dyeing of a good fast- 30 ness to light is obtained. The dyestufl thus produced on the fiber corresponds to the formula:

mo on 1 Hi0v C0-NH 40 Example 2 neutralized with sodium bicarbonate, then rinsed and soaped at the boil.

In this manner a dark brown dyeing of a very good fastness to light is obtained. The dyestuff thus produced on the fiber corresponds to the formula:

OCH; I

N=N No:

Hi0 OH (|)CH:

H1O CO--NH OCH:

By using the diazo compound of 3,2'-dimethy1- 4-amino-azo-benz we a dark brown, by using that of 4-nitro-2-meth, i-l-amino-benzene a greyish brown dyeing is obtained.

Example 3 Acetate-silk is impregnated with a solution containing per liter 0.25 grs. of 4,4'-diamino-3,3'-dimethoxy-diphenyl and 1 cc. of hydrochloric acid of 20 B. and, after rinsing, treated in the customary manner in a bath containing nitrite and hydrochloric acid. Then the goods are again rinsed and developed with a solution containing per liter 2 grs. of (4-hydroxy-1,2-dimethyl-benzene-5-carbony1)-amino-benzene and 0.8 grs. of calcined sodium carbonate.

In this manner a dark brown dyeing is obtained. The dyestuff thus produced on the fiber corresponds to the formula:

BIC CO-NHQ zene-5-carbonyl)-amino-benzene by 1-(4-hydroxy-1,2-dimethyl-benzene- 5 -carbony1) amino- 2,5-dimethoxy-benzene there are obtained on acetate-silk by means of the tetrazo compounds or tetrazo-azo-compounds of Shades 4,4-diamino-3,3-dimethoxy-dipheny1 Yellowish brown 4,4-diamino-3,3'-dichloro-dipheny1 Yellowish brown 3,2',5'-trimethoxy-4,4'-diamino-azobenzene Reddish brown 2,5'-dimethoxy-2'-methyl 4,4 diamino azobenzene Brown 2,2,5'-trimethoxy-4,4-diamino-azobenzene Reddish brown or by means of the diazo-azo-compound of:

Shades 3,2-dimethoxy-4-amino-azobenzene Yellowish brown Example 4 Viscose is padded for half an hour in a bath containing per liter 10 grs. of 1-(4-hydroxy-L2- dimethyl-benzene 5 carbonyl) amino 2,4 di methyl-benzene, 20 cc. of a caustic soda solution of 34 B. and 20 cc. of Turkey red oil, 10 grs. of common salt being gradually added. Then the goods are well centrifuged and treated in a solution containing per liter the diazo compound of 2.8 grs. of 4-benzoy1amino-3-methoxy-6-chlorol-amino-benzene and being freed from the excess of mineral acid by the addition of sodium acetate.

After rinsing and soaping a yellowish brown dyeing is produced. The dyestufi thus produced on the fiber corresponds to the formula:

OCH: HaC OH (IO-NHGCH:

1- (4-hydroxy-1,2-dimethyl-benzene-5 carbonyl) amino-3-ch1oro-benzene yields with the diazo compound of Shades 2,51- dichlorol-amino-benzene Brown 4-chloro-2-methyll-amino-benzene Reddish brown 3,2 -dimethyl-4-amino azo-benzene Dark brown 4;am.ino-4' amethoxy-kiiphenylamine- Brown 1- (4 hydroxy- 1,2-dimethy1-benzene-5-carbony1) amino-Z-methoxy-S-chloro-benzene yields with the diazo compound of Shades 2,5-dichloro-1-amino benzene Yellowish brown 4-ch1oro-2-methyl-l-amino-benzene Yellowish brown 2-nitro-l-amino-benzene Greyish brown 2-nitro-4-methyl-l-amino-benzene Greyish brown l-amino-anthraquinone Reddish brown 4'-nitro-2,5-dimethoxy-4-amino-azobenzene Brownish black 1 (4-hydroxy-1,2-dimethyl-benzene-5carbonyl) amino-2-methoxy-5-nitro-benzene yields with the diazo compound of:

Shades 4-nitro-2-methy1-l-amino-benzene Greyish brown 4-nitro 2-methoxy-l-amino-benzene Greyish brown 3,2'-dimethy1-4-aminoazo-benzene -Dark brown 1 -(4-hydroxy-1,2-dhriethyl-benzene-5-carboziyl) aminomaphthalene yields with the dim compound oi:

Shades 2,5-dichioro-l-aminoi-benzene "Brown 4-chloro-2-methyl-1-amino-benzene Reddish brown 5-cl'iloro-2-phenoxy- 1 -amino-benzene Brown 2-nitro-4-methyl-l-amino-benzene.

Blackish brown 4-nitro-2-methyl-l-amino-benzenenfi Violetish brown 4-nitro-2-methoxy-l amino-benzene Brownish black 3,2'-di methyl-4-amino-azo-benzene -..e

Dark brown 2-(4-hydroxy-L2-dimethyl-benzene-S-carbonyl) amino-naphthalene yields with the diazo compound of:

1- (4-hydroxy- 1,2 dimethyl-benzene-S-carbonyl) amino-4-methoxy-naphthalene yields with the diazo compound of:

' Shades 2,5-dichloro-1-amino benzene ..Brown 2-nitro-4-methyl-l-amino-benzene Blackish brown 4-nitro-2-methoxy-l-amion-benzene Brownish black 2- (4-hydroxy -.-1 ,2-dimethyl-benzene-5-carbonyl) amino-l-methyl-naphthalene yields with the diazo compound of:

Shades 2,5 -dichloro-l-amino-benzene Brown 3,2'-dimethyl-4-amino-azo-benzene Blackish brown 1-(4-hydroxy-1, 2-dimethyl-benzene-5-carbonyl) amino-5-chloro-naphthalene yields with the diazo compound of:

Shades 2,5-dichloro-l-amino-benzene ....Brown 5-chloro-2-phenoxy l-amino-benzene Reddish brown 4-nitro-2-methyl-l-amino-benzene BlackishBrown 1 -(4-hydroxy-1,2-dimethyl-benzene-5-carbonyl) amino-S-nitro-naphthalene yields with the diazo compound of:

' Shades 2,5-dichloro- I -amino -benzene Brown 4-nitro-2-methyl-l-aminc-benzene ckish brown 1,5 di-( 4 -hydro:w- 1,2-dimethyl-benzene-5-carbonyl-amino) -naphthalene yields with two molecular proportions of the diazo compound Shades 2,5-dichloro-l-amino-benzene ..Full brown -chlor-2-phenoxy-1-amino-benzene Darkreddish brown 4-nitro-2-methoxy l-amino -b nzene -Brownish blac 1,4-di- (4-hydroxy 1,2 --dimethyl-benzene-5-carbonyl-amino)benzene-yields withLtwomolecular proportions of the diazo compound of Shades 2,5-dichloro-l-amino-benzeneenr Reddish brown 4 -chloro-2-methyll-amino-henzene Beddish brown 5-nitro-2-methoxy-1-amino -benzene Dark reddish brown l-amino-anthraquinone Dark brown 4,4'-di-(4-hydm'oxy-1,2-dimethyl-benzene-5 carbonyl-amino) 3,3'-dimethoxy-diphenyl yields with two molecular proportions of the diazo compound of:

Shades 3-chloro-l-amino-benzene Yeilowish brown 2,5-dichloro-l-amino-benzene Brown 2,4,5-trichloro-1-amino-benzene Yellowish brown 5-chloro-2-phenoxy-l-amino-benzene Brown 2,5-dichro-4-methyl-l-amlno-benzene Yellowish brown 4-chloro-2-nitro-1-amino-benzene -Dark brown Example 5 Well boiled and dried cotton yarn is impregnated with a solution containing per liter 20 grs. of (4-hydroxy-1-chloro-2-methyl-benzene-5-carbonyl)amino-benzene, 30 cc. of caustic soda solution of 34 B. and 30 cc. of Turkey red oil and being mixed with 20 grs.'of common salt. The goods are wrung out and developed with a solution containing per liter the diazo compound of 1.62 grs. of 2,5-dichloro-l-amino-benzene and being neutralized with sodium bicarbonate. Then they are rinsed and soaped at the boil.

In this manner a yellowish brown dyeing is obtained. The dyestufl thus produced on the fiber corresponds to the formula:

HzC OH 01 OO'NH Example 6 Cotton goods, previously treated in the customary manner, are padded with a solution containing per liter l0 grs. of l-(4-hydroxy-1-chloro- 2-methyl-benzene-5-carbonyl) amino-2 methyl d-chloro-benzene, 20 cc. of caustic soda. solution oi! 34 B. and 20 cc. 01' Turkey red oil and being mixed with 20 grs. of common salt. The goods are dehydrated and developed in a solution containing per liter the diazo compound of 1.42 grs. of 5-chloro-2methyl-1 amino benzene. After finishing in the usual manner, a reddish brown dyeing of a good fastness to light is obtained. The

dyestufl thus produced on the fiber corresponds to the formula:

OH (13H:

When the goods thus padded are developed with diazotized 2,5-dichloro-l-amino-benzene a brown dyeing, with 2,4,5-trichloro-1-amino-benzene a greylsh brown dyeing, with 2-nitro-4-methyl-1- amino-benzene a brownish black, with 4-nitro-2- methoxy-l-amino-benzene likewise a brownish black dyeing is obtained.

By producing the dyestuffs on acetate silk the same arylamide yields with diazotized l-aminonaphthalene a brown, with half the molecular proportion of tetrazotized- -amino-benzene-azo- 4'-amino-naphthalene a dark reddish brown, with 4,4-diamino-3,3'-dimethoxy-diphenyl a yellowish brown dyeing.

The same arylamide yields on wool with a diazo compound of 2,5-dichloro-4-methyl-1- amino-benzene a yellowish brown dyeing.

Example 7 Cotton yarn previously treated in a suitable manner is padded with a solution containing per liter 10 grs. of 1-(4-hydroxy-1-chloro-2-methylbenzene-5-carbonyl)amino-naphthalene, 20 com. of caustic soda solution of 34 B. and 20 cc. of Turkey red oil and being mixed with 20 grs. of common salt. After being squeezed out, the goods are developed in a solution containing per liter the diazo compound of 2 grs. of 2,4,5-trichloro-1- amino-benzene and being neutralized with sodium bicarbonate. After finishing in the usual manner, a reddish brown dyeing is obtained. The dyestufi thus produced on the fiber corresponds to the formula:

l H1O OH c1 01 c ONH Example 8 Viscose is impregnated with a solution containing per liter 10 grs. of 1-(4-hydroxy-1-chloro- 2 methyl-benzene 5 carbonyDamino-2-methoxy-4-chloro-benzene, 20 cc. of caustic soda solution of 34 B. and 20 cc. of Turkey red oil with a gradual addition of 10 grs. of common salt. After half an hour the goods are well centrifuged and developed with a solution containing per liter the diazo compound of 1.4 grs. of 2- nitro-I' amino-benZene and being neutralized with sodium acetate. After rinsing and soaping, a blacklish violet dyeing is obtained. The dyestuff thus produced on the fiber corresponds to the formula: N0:

Hi0 OH OCH:

Cl CO-NH C1 The same aryl-amide yields with the diazo compound of 4-chloro-2-nitro-1-amino-benzene a. dark brown dyeing.

The following table shows the shades of some other combinations of this kind:

l-(4-hydroxy-1-chloro 2 methyl-benzene 5 carbonyl)amino-4-chloro-benzene, yields with the diazo compound of:

Shades 2,5-dichloro-l-amino-benzene Reddish brown 2-nitro-1-amino-benzene Brownish violet 4-chloro-2-nitro-l-amino-benzene Brown 2,5-dichloro-4-methyl-l-amino-benzene- Reddish brown 1 ,4-dii-hydroxy- 1-chloro-2-methyl-benzene-5' carbony1-amino benzene yields with two molecular proportions of the diazo compound of:

Shades 2,5-dichloro-l-amino-benzene Full brown 2,4,5-trichloro-l-amino-benzene Yellowish brown 5-chloro-2-phenoxy-1-amino-benzene Dark brown 3,2'-dimethyl-4-amino-azo-benzene Olive brown 4-nitro-2-methoxy-l-amino-benzene Greyish brown l-amino-anthraquinone Violet brown 1,4-di- (4-hydroxy- 1-chloro-2-methyl-benzene-5- carbonyl-amino)2-methyl 5 methoxy-benzene- 7 yields with two molecular proportions of the di azo compound of:

Shades 2,5-dichloro-l-amino-benzene Dark brown 2,4,5-trichloro-l-amino-benzene Yellowish brown 5-chloro-2-methyl-l-amino-benzcne Reddish brown 2-amino-4-chloro-diphenyl-ether Dark brown 2-nitro-4-methyl-l-amino-benzene Brown 3,2-dimethyl-4-amino-azo-benzene Olive brown 1.5 di-(4-hydroxy-i chloro-2-methyl-benzene- 5-carbonyl-amino) -naphthalene yields with two molecular proportions oi. the diazo compound oi:

- Shades 2,5-dichloro-1-amino-benzene l)ark brown 5-chloro-2-phenoxy-l-amino-benzene Dark brown 1,4-di-(4-hydroxy-1-chloro-2-methyl benzene- 5-carbonyl-amino) -2-methoxy-5-chloro-benzene yields with two molecular proportions oi the diazo compound of: V, r

shades I 2,4,5-trichloro-1-amino-benzene 1,4-di- (4-hydroxy-1-chloro-2-methyl-benzene-5- carbonyl-amino) 2,5-dimethyl-benzene yields with two molecular proportions of the diazo compound oi': r

' Shades 2,5-dichloro-1-amino-benzene Reddish brown 2,4,5-trichloro-l-amino-benzene Yellowish brown 5-chloro-2-phenoxy-l-amino-benzene Dark brown 4-nitro-2-methoxy-l-amino-benzene -Blackish brown Example 9 Well boiled and dried cotton yarn is impregnated with a solution containing per liter 10 grs. of 1-(4-hydroxy-2-chloro-l-methyl-benzene-Evcarbonyl) amino-2-methyl-4- chloro-benzene, 20

cc. of caustic soda. solution of 34 B. and 20 cc.

of Turkey red oil with the addition of 20 grs. of common salt. The goods are well wrung out and developed with the solution containing per liter the diazo compound of 1.62 grs. of 2,5- dichloro-l-amino-benzene and being neutralized with sodium. bicarbonate. After rinsing and soaping at the boil 9. full brown dyeing of a good fastness to light is obtained. The dyestufl thus produced on the flber corresponds to the formula:

on cm o -NHO01 The same arylamide yields with the diazo compound of -chloro-2-methyl-l-amino-benzene a reddish brown dyeing.

Example Hsc - azo-4'-amino-naphthalene, 3 cc. of hydrochloric a dark brown dyeing 01 a very good iastness to light is obtained. The dyestuir thus produced on the tiber corresponds to the formula:

B80 (JO-NH 01 on Cl The same aryiamide yields with the diazo compound of 2,5-dichloro-1-amino-benzene a dark brown, with that of 4-nitro-2-methoxy-1-aminobenzene or 3,2-dimethyl-4-amino-azo-benzene blackish brown dyeings.

Example 11 Acetate silk is impregnated with a solution containing per liter 1.5 grs. oi 4-amino-benzeneacid of 20 B. and 10 grs. of sodium acetate. After rinsing the goods are treated in the customary manner in a bath of nitrite and hydrochloric acid. Thereafter they are again rinsed and developed ,with a solution containing per liter 2 grs. oi 1-(4-hydroxy-2-chloro-1-methylbenzene-5-carbonyl) amino 2 methyl-4-chloro-, benzene and 2 cc. 0! caustic soda solution of 34 B.

In this manner a dark reddish brown dyeing is obtained. The dyestuif thus produced on the fiber corresponds to the formula:

Etc

Cl OH (I311! co-NnOci By replacing the diazo component by that of l-amino-naphthalene a brown dyeing, by that of 4,4'-diamino-3,3'-dimethoxy-diphenyl a yellowish brown dyeing is obtained.

HIC

Example 12 Viscose is impregnated in a bath containing per liter l0 grs. of 1-(4-hydroxy-2-chloro-1- methy1-benzene-5-carbonyl) amino- 2 methyl-4- chloro-benzene, 20 cc. of a caustic soda solution 7 of 34 B. and 20 cc. of Turkey red oil for half an hour with the gradual addition of 10 grs. of common salt. Then the goods are well centrifuged and developed in a solution containing per liter the diazo compound of 1.7 grs. of 4-nitro-2- methoxy-l-amino-benzene and being freed from its excess of mineral acid by the addition of sodium acetate. After rinsing and soaping a brownish black dyeing is obtained. The dyestufi thus produced on the fiber corresponds to the formula:

OCH;

N=N NO:

01 OH CH; H CO-NHGCI By replacing the diazo compound by that of 2,5-dichloro-4-methyl-l-amino-benzene a reddish brown dyestufi is produced.

The following table shows the shades of other combinations of this kind:

some

(4-hydroxy-2-chloro-l-methylbenzene 5 carbonyDamino-benzene yields with the diazo compound of:

Shades 2,5-dichloro-l-amino-benzene Brown 3,2-dimethyl-4-amino-azo-benzene Dark brown 1-(4-hydroxy-2-chloro-l-methyl-benzene-S- carbonyl)amino-2,5-dimethoxy-benzene yields with the diazo compound of:

Shades 2,5-dichloro-l-amino-benzene Brown 2,5-dichloro-4-methyl-l-amino-benzene Yellowish brown 4-chloro-2-nitro-l-amino-benzene Brown 2-(4-hydroxy-2-chloro-1-methyl-benzene-5- carbonyDamino-naphthalene yields with the diazo compound of:

Shades 2,5-dichloro-l-amino-benzene Reddish brown 4-chloro-2-nitro-1-amino-benzene Brown 1- (4-hydroxy-2-chloro-1- methyl-benzene-B-carbonyl) amino-2-methyl-4 -chloro benzene yields with the diazo compound of Shades 3-chloro-1-amino-benzene Reddish brown 2,4,5-trichloro-l-amino-benzene Yellowish brown 5-chloro-2-phenoxy-l-amino-benzene Dark reddish brown 2-nitro-4-methyl-l-amino-benzene Blackish brown 3- (4-hydroxy-2-chloro-1-methyl-benzene-5- carbonyl)amino-carbazole yields with the diazo compound of Shades 5-chloro-2-phenoxy-l-amino-benzene Yellowish brown 3,2-dimethy1-4-amino-azo-benzene Brown 1,4-di- (4-hydroxy-2-chlorol-methyl-benzene-S- carbonyl-amino) -benzene yields with two molecular proportions of the diazo compound of:

v Shades 2,5-dich1oro-1-amino-benzene Brown 2,4,5-trichloro-l-amino-benzene Yellowish brown 5-chloro-2-phenoxy-2-aminobenzene Dark brown 2-nitro-4-methyl-l-amino-benzene Dark reddish brown 3,2-dimethyl-4-amino-azo-benzene Brown 1,4-di-(4-hydroxy-2-chloro-l-methyl-benzene-S- carbonylamino) 2,5 dimethoxy benzene yields with two molecular proportions of the diazo compound of:

Shades 2,5-dichlor0- l-amino-benzene- -Yellowish brown 5-ch10ro-2-phenoxyl-amino-benzene- Brown 1,4-di-(4-hydroxy-2-chloro-1 methyl benzene- 5-carbonyl-amino) -2-methoxy-5-chlorobenzene yields with two molecular proportions of the diazo compound of:

Shades 2,5-dichloro-1-amino-benzene Brown 5-chloro-2-methoxy-1-amin0-benzene Dark brown 4-nitro-2-methoxy-l-amino-benzene Blackish brown 3,2'-dimethyl-4-amino-azo-benzene Brown 1,5-di-(4-hydroxy-2-chloro-1 methyl benzene- 5-carbonyl-amino)-naphthalene yields with two molecular proportions of the diazo compound of Shades 2,5-dichloro-1-amino-benzene Brown 5-chloro-2-phenoxy-1-amino-benzene Brown 3,6-di-(4-hydroxy-2-chloro-l-methyl-benzene-5- carbonyl-amino) -carbazole yields with two molecular proportions of the diazo compound of:

' Shades 3-chloro-1-amino-benzene Brown 2,4,5-trichloro-l-amino-benzene Brown l-amino-anthraquinone Reddish brown 4'-nitro-2,5-dimethoxy-4-amino-azo-benzene Dark brown We-claim: 1. The azo dyestuffs containing arylamides of the formula:

wherein the X5 means methyl groups one of which may be replaced by a chlorine atom, n means the number 1 or 2 and R a benzene, naphthalene, diphenyl or carbazole nucleus which may be substituted by alkyl, alkoxy, halogen or nitro groups, attached by means of azo groups to the aromatic nuclei of the group consisting of benzene, naphthalene, anthraquinone, which may contain as substituents alkyl, alkoxy, phenoxy, halogen, nitro-groups, a phenylazoor naphthylazo-group, which compounds are insoluble in water and yield when produced on fibers brownish to black dyeings.

2. The azo dyestuffs of the general formula:

wherein R1 stands for the radical of any aromatic diazo compound, both X's stand for methyl or one for methyl and the other for chlorine, and

R2 for any aromatic radical of the benzene, naphthalene, diphenyl or carbazole series which products, in a dry state, are yellow-brown to dark colored powders which dye the fiber fast yellow, orange, brown and dark brown tints.

4. The azo-dyestuffs which correspond to the general formula:

wherein the two R1s stand for the radical of any aromatic diazo compound, both X's stand for methyl or one for methyl and the other for chlorine, and R2 for any aromatic radical of the benzene, naphthalene, diphenyl or carbazole series, which products in a dry state, are dark brown powders and, when produced on the fiber, dye the same brown tints which are intensive.

5. The azo-dyestuffs which correspond to the general formula:

N=N-R1 x on x CONH- 2 wherein the two R1s stand for the radical of a diazotized ortho-aminodiphenylether which is halogenated in the nucleus containing an amino group, both Xs stand for methyl or one for methyl and the other for chlorine, and R: for

any aromatic radical of the benzene, naphthalene, diphenyl or carbazole series, which products, in a dry state, are dark brown powders and, when produced on the fiber, dye the same brown tints which are intensive.

6. The azo dyestufi of the formula:

which compound is insoluble in water and yields when produced on fibers dark brown dyeings.

'7. The azo dyestufi of the formula:

which compound is insoluble in water and yields when produced on fibers greyish brown dyeings.

8. The azo dyestufl of the formula:

mo 0H t; HSC c O-NHUi) which compound is insoluble in water and yields when produced on fibers brown dyeings.

9. Fiber dyed with the azo dyestuffs as claimed in claim 1.

10. Fiber dyed with the azo dyestufls as claimed in claim 2.

11. Fiber dyed with the azo dyestufi as claimed in claim 6.

12. Fiber dyed with the azo dyestufl as claimed in claim 7.

13. Fiber dyed with the azo dyestufi as claimed in claim 8.

LEOPOLD LASKA. ARTHUR ZITSCHER. 

